Very scarce within the study area althought is possible that some stations have been overlooked. Only site at Cottingham.
J F Robinson 1902: "Common in copses and old lanes, as near Cottingham".
Herbarium material: HLU : Thwaite Hall, Cottingham 1938 (G A Glister}. BBC : Cottingham, 1864; Hull 1864. HUM : Willerby Road, Hull 1891 {J R Waller}.
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